diff --git a/INSTALL b/INSTALL
--- a/INSTALL
+++ b/INSTALL
@@ -166,6 +166,12 @@
 
 Note: An example of an output of cmake can be seen in https://phabricator.kde.org/w/krusader/cmake-output/
 
+Note: If Krusader is going to be built under the 16.04 LTS version of Ubuntu (or Kubuntu, etc.) then
+installing Qt 5.9 (or newer) is needed (it could be downloaded from https://www.qt.io/offline-installers) and
+the aforementioned cmake command would need (at its end) an additional argument like:
+    -DCMAKE_PREFIX_PATH=/opt/Qt/5.9/gcc_64/
+if e.g. Qt 5.9 was installed inside /opt
+
 
 --- Compilation and installation
 
diff --git a/doc/index.docbook b/doc/index.docbook
--- a/doc/index.docbook
+++ b/doc/index.docbook
@@ -28,6 +28,22 @@
 <!ENTITY NFS   "<acronym>NFS</acronym>">
 <!ENTITY USB   "<acronym>USB</acronym>">
 <!ENTITY Samba "<application>Samba</application>">
+
+<!-- For the 16.04 LTS version of Ubuntu (or Kubuntu, etc.) -->
+<!ENTITY Left "<keycap>Left</keycap>">
+<!ENTITY Right "<keycap>Right</keycap>">
+<!ENTITY Up "<keycap>Up</keycap>">
+<!ENTITY Down "<keycap>Down</keycap>">
+<!ENTITY Ins "<keycap>Ins</keycap>">
+<!ENTITY Space "<keycap>Space</keycap>">
+<!ENTITY Home "<keycap>Home</keycap>">
+<!ENTITY End "<keycap>End</keycap>">
+<!ENTITY Meta "<keycap>Meta</keycap>">
+<!ENTITY PgUp "<keycap>PgUp</keycap>">
+<!ENTITY PgDn "<keycap>PgDn</keycap>">
+<!ENTITY Debian "<productname>Debian</productname>">
+<!ENTITY PDF   "<acronym>PDF</acronym>">
+
 <!-- <!ENTITY % addindex "IGNORE"> -->
 <!ENTITY % addindex "INCLUDE">
 
diff --git a/krArc/krarc.cpp b/krArc/krarc.cpp
--- a/krArc/krarc.cpp
+++ b/krArc/krarc.cpp
@@ -24,6 +24,7 @@
 
 // QtCore
 #include <QByteArray>
+#include <QCoreApplication>
 #include <QDebug>
 #include <QDir>
 #include <QFile>